A spherical balloon is being inflated.Let r(t)=3t can represents its radius at time t seconds and let g(r)=4/3 pie r be the volume of the same balloon if its radius is r.Write (g.r) in terms of t and describe what it represents.

Answer 1

that's PI, not pie!!

and I have no idea what g.r means.

g(r) = 4/3 pi r^3 = 4/3 pi (3t)^3

If you want, you can expand that out. This is just Algebra I, right?